How to check TypeScript version installed in Visual Studio?

To check which version of TypeScript is your Visual Studio using, there are 3 ways.

First, you can open Visual Studio and then go to Help menu. Under
Help menu, click on About Microsoft Visual Studio - a popup will
open that will list all installed products on Visual Studio, you can
find TypeScript version there. Please see below screenshot:

Second way, If you have multiple versions of TypeScript installed on your machine,
then you can yo on this path C:\Program Files (x86)\Microsoft
SDKs\TypeScript and here you will find the list of TypeScript
version installed on your machine. Please see below screenshot:

Third way of checking TypeScript version is to open Visual Studio and
go to Tools > Options menu. A popup will open then - like below
screen, there you can change below highlighted property to Detailed.
Once you change it to Detailed and the build the project - you can
check the output window to find which version of TypeScript is used
by Visual Studio for compilation of .ts files.